5AR4=GZ34=CV1377 Full-Wave Rectifier (5AR4=5V @ 1.9A Filament, PIV=1500V, Imax=225-250ma)

(click on links below to check stock) 5AR4=GZ34 Philips and Philips Miniwatt Holland metal base 1951 - 1958 (1st version and best) 5AR4=GZ34 Philips and Philips Miniwatt Holland black base and brown base 1958 - 1963 5AR4=GZ34 Mullard England "FAT BASE" 1958 - 1962 (f31 series) 5AR4=GZ34 Mullard England 1962 - 1975 (f32 series) 5AR4=GZ34 GE "small bottle" 1960's 5AR4=GZ34 Sylvania "Big Bottle" 1970's 5AR4=GZ34 JAPAN 1960's - 1970's
BEST SELLER 5AR4=GZ34 VALVO HOLLAND 1958 (f31 series) (1st series after metal base tubes) GZ34 Valvo Holland NOS 1958 double "D" getter halos in original wrapping TO BUY GZ34 Holland 1958-1962
- Modwright Oppo 95 power supply - Modwright Oppo 105 power supply 9.9 - Modwright 36.5 power supply
5AR4=GZ34 Mullard England "FAT BASE" 1958-1962 (the first Mullard series made and best sounding GZ34 Mullard) (base diameter = 1.4") (f31 series) - VOX AC30 - CARY - Matchless Chieftan TO BUY GZ34 Mullard FAT BASE

5AR4=GZ34=CV1377 Mullard England 1962-1975 - Bob Latino M-125 - Cary - Dynaco ST-70 - Scott LK-48 - Matchless SC30 - Matchless Lightning 15 - Melody H2A Integraded Amp - Modwright PS and 9.0 preamp - Modwright LS100 - Supratek (all models) - Marshall - Fender - Dr. Z Z-28 (6V6 amp) - VOX AC15, AC30 - Prima Luna PL3 preamp - Victoria Double Deluxe (Tweed) - Victoria Regal 2 - Donald North headphone amp - Cary 302 MK2 phono - AES AE-3 MKII preamp TO BUY GZ34 Mullard 1962-1979
TO BUY GZ34 Mullard branded Raytheon Kuhl-Tube cryo-treated

TO BUY GZ34 Philips Miniwatt Metal Base

5AR4=GZ34 Holland "Black Base" and "Brown Base" 1958-1962 - Woo Audio 6 - Cary PH302 phono TO BUY GZ34 Valvo Holland 1958
TO BUY GZ34 Adzam Holland Kuhl-Tube cryo 1960
TO BUY CV1377=GZ34 Philips Belgium/Holland 1961-1962 pair

5AR4=GZ34 GE small bottle 1960's - Tubelab SE ( - Trinity TC-15 (2010) TO BUY GZ34 GE

Sylvania Big Bottle 1970's - Tubelab SE ( - Trinity TC-15 (2010) - Pagano 300B SET - Dynaco ST-120 (ST120) - Swart Atomic Jr (2011) TO BUY GZ34 SYLVANIA

5AR4=GZ34 JAPAN 1970's 5AR4 JAPAN "X" raised edge on top of glass
GZ34 / 5AR4 SUBSTITUTE (with limitations) The 5Z4GT is a good sub for the 5AR4. To be a good sub, it must be INDIRECTLY heated (Most 5 volt rectifiers are DIRECTLY heated, but the 5AR4 / GZ34 isn't). Also it must be small, so as to fit into the same space as the 5AR4. The British type GZ37 fits the first requirement, but is alot taller, almost as big as a 5R4. The 5AR4 is rated up to 250 mA, and most stereo amps will pull a fair load from them. Some monoblocks, however, don't use half that much current. (example: the British QUAD II amps). For lower current requirements I recommend the 5Z4GT type which are an indirectly heated type very similar in size and appearance to the 5AR4. The 5Z4GT is good for 350 V on the plate vs. 450 V for the 5AR4. It also has a MAX DC Output current rating of 125ma vs. 250ma for the 5AR4. Use it as a sub for the 5AR4 only where ratings permit.
The GZ34 is an example of a typical high current rectifier for small equipment use. It is indirectly heated but the cathode is tied to one side of the heater. The transformer HT winding would be centre tapped. The centre going to ground. Each anode goes positive in turn and current flows. This way rectification takes place on every half cycle, and gives the name full wave. The wide glass tube envelope is 32mm in diameter, the base is wider, and the valve stands 72 mm high from base to the top of the envelope. This excludes the base pin length. (5AR4=5V @ 1.9A Filament, PIV=1500V, Imax=225-250ma) Characteristics and limiting values: Capacitor input --------------- Vtr 2x300 2x350 2x400 2x450 2x500 2x550 Vrms Io <250 <250 <250 <250 <200 <160 mA Rt 2x50 2x75 2x100 2x125 2x150 2x175 ohm C <60 <60 <60 <60 <60 <60 F Vout 300 350 400 450 530 610 V Choke input ---------- Vtr 2x300 2x350 2x400 2x450 2x500 2x550 Vrms Io <250 <250 <250 <250 <250 <225 mA L 10 10 10 10 10 10 H Rt 0 0 0 0 0 0 ohm Vout 240 283 326 370 415 460 V